Redirect deployment guide subdirectories appropriately
Redirect deployment guide subdirectories appropriately

Currently it is possible to access [1] and [2] which shows
a bare autoindex. This patch ensures that accessing these
URL's redrects to the current stable deployment guide
index.

[1] https://docs.openstack.org/project-deploy-guide/
[2] https://docs.openstack.org/project-deploy-guide/openstack-ansible/

Change-Id: Ib7a0e14283601b5c36e14ab298b5c6df948ec0c0

openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals,openstack/openstack-manuals